Safety attachment for hydraulic elevators



(No Model.) 3 Sheets-Sheet 1; A. MURPHY.

SAFETY ATTACHMENT FOR HYDRAULIC ELEVATORS.

Patented Mar. 9, 1886.

Nv PETERS. PholvLnlmgu-apner. Waxhinzlnn. D. c.

(No Model.)

A. MURPHY.

3 Sheets-Sheet 2.

SAFETY ATTACHMENT POE HYDRAULIG ELEVATORS.

Patented Mar. 9, 1886.

IZKZZZ Z'TEESEE.

(No Model.) 3 Sheets-Sheet 3.

A. MURPHY. SAFETY ATTACHMENT FOR HYDRAULIC ELEVATORS.

No. 337,781. Patented Mar. 9, 1886.

UNITED STATES PATENT OFFICE.

ANDREW MURPHY, OF COLUMBUS, OHIO.

SAFETY ATTACHMENT FOR HYDRAULIC ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 337,781, dated March 9, 1886.

Application filed April 9, i885. Serial No. 161,664. (No model.)

To aZZ whom it may concern:

Be it know that 1, ANDREW MURPHY, of Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Safety Attachments for Hydraulic Elevators; andIdo hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use it, reference being bad to the accompanying drawings, which form part of this specification.

My invention relates to an improvement in safety attachments for hydraulic elevators; and it consists in,first, the combination of the cylinder, the piston, the pipe connected to the cylinder at one end, a relief-valve connected to the pipe, a weighted rod connected to the valve, connecting'rods connected to both the weighted rod and to the slide which is operated by the piston; second, the combination of the cylinder, piston, pipe connected to the cylinder, relief-valve, weighted rod connected to valve, connecting-rods, slide, and arm provided with a set-screw; third, the combination of the open-ended cylinder, the piston placed therein, the arm provided with a setscrew, the slide, the connecting-rods, the bellcrank lever, and the valve, as will be more fully described hereinafter.

The object of my invention is to provide hydraulic elevators with a safety-valve which opens when the pressure in the supply-pipe exceeds a certain amount, and to provide an attachment which is made to operate a valve whenever the full stroke of the piston is reached, and thus prevent the piston from being forced out of the cylinder when the valves leak, or when operating-cables break or become detached, as is often the case.

Figures 1 and 2 are side elevations of my invention,taken from opposite sides. Fig. 3 is a plan view of the same. Fig. 4 is a perspective of the cylinder, showing the elevator con nected thereto.

A represents the cylinder, B the piston placed therein, 0 the piston-rod, and D the supply-pipe. The supply-pipe D, through which the water passes to and from the cylinder, is connected to the water main or pipe 'struction and operation is here given.

a between the two cocks b c. When the cock 6 is opened and the one, 0, is closed, the water flows through the pipe D and operates the piston. \Vhen the cock b is closed and the one, 0, opened, the water flows from the cylinder through the pipe D and the elevator descends.

No claim as to novelty is made to the ele vator, and hence no description of its conrelief valves are not necessary and in practice the one, H, alone is used. These valves may be attached directly to the supply pipe, but as the valve must be placed at one side of the cylinder, a branch pipe, T, may as well be used as to bend the main pipe around the corner. It is simply a matter of convenience to use a branch pi pc.

Placed on a pipe, T, which branches off from this supply-pipe at any suitable point, is a safety-valve, F, of any suitable construction, which can be adjusted to any pressure desired. Whenever the pressure in the supply-pipe eX- ceeds a certain regulated amount, this valve opens and allows the water to flow into the sewer. In case of fire, should the pressure of water become too great and the platform get caught at one of the floors while ascending, this safety-valve opens and allows the water to escape in sufficient quantities to relieve the pressure in the pipe.

Also placed upon the supply-pipe at any suitable point is a valve, G, which can be used to shut off the water whenever it becomes necessary to repair or lubricate one or both of the other valves. This valve G is a great convenience, but is not absolutely essential to the proper working of my invention.

Also attached to the pipe T, which branches off from the supply-pipe D on the other side of the valve G from the safety-valve F, is a second relief-valve,H.

Both of the safety-valves F H are connected by the pipe 6 with the sewer i, so that should either one of the valves be opened by excess Two 60 movement of the piston in the cylinder.

one should fail to act. The lever I of this valve is weighted, as shown, and to the outer end of the lever is fastened a connecting-rod, I. In the lever are made a number of perforations, by means of which both the weight and the connecting-rod can be adjusted back and forth at the will of the operator. The lower end of the connecting-rod is fastened to the bell-crank lever J at one end, and to the other end of the lever is fastened another connecting-rod, L,which connects the lever to the slide N. This slide N consists of a straight rod or bar, which is slotted, and through which pass the rods 0, by means of which it is supported in position. which supports the bell-crank lever are secured to the side of the cylinder in any suitable manner. To the outer end of the slide is attached a suitable arm,-P, which extends at right angles to the slide, and passing through the outer end of this arm at right angles to it is a set-screw, R, which is to be struck by the piston when it reaches the full length of its stroke. The end of the cylinder is left open,

and this set-screw projects into this open end,

so that when the piston reaches the full length of its regular stroke, as when the elevator reaches the full height of its movement, the slide will be moved endwise and open the valve H,so as to allow the water to flow freely from the supply-pipe, and thus stop all further y adjusting both the arm and the set-screw, or either one alone, the length of the stroke of the piston is readily adjusted, and thus the height-to which the elevator shall be raisedis regulated; By thus opening the valve when These rods 0 and the one,

inder, so as to allow the cellar to be flooded with water or the platform to be moved farther than is desired. When the platform is in motion, should any part of the load project and comein contact with the floor, the safety-valve F or H, or both, at once open and thus allows the water to escape and the platform to stop without any part being broken or injured.

Having thus described my invention, I claim- 1. The combination of the cylinder A, the piston B, the pipe D, connected to the cylinder at one end, a relief-valve, H, connected to the pipe, a weighted rod connectedto the valve, and connecting-.rods'connected to both the weighted rod .and to the slide-which is operated by thep'iston, substantially'as shown. 2. 'The' combination ofthe cylinder A, piston B, pipe'D, relief-'valveH, weighted rod I, 'connecting-rods IJ L, slide N, and arm P, pro.- vided with a set-screw, substantially as dee scribed.

3. The combination of the open-ended cylinder, the piston placed therein, the arm provided with the set-screw, the slide, the-com necting-rods, the bell-crank lever, and'the valve, the parts "being arranged to operate substantially as specified.

In testimony-whereof I affix my signature in presence of two witnesses.

ANDREW MURPHY.

Witnesses:

E. L. .DE WITT, J. S. GOLD. 

